anatomy in relation to complet denture

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Transcript of anatomy in relation to complet denture

intraoral landmarksanatomy in relation to complet dentureanatomy in relation to complet dentureimaginary line running from the inferior border of the ala of the nose to the superior border of the tragus of ear

used to establish the posterior occusal plane of the artificial teethala tragus lineinter pupillary lineimaginary line running btween the two pupils of the eyes when patient looking straight forwardnaso labial sulcusits acrease that extends from the ala of the nose to the corner of the mouthit become deeper and more prominent with aging and due loss of teeth

so,it should be restored by proper denture contour and tooth positionmento labial sulcusrun from side to side horizontaly between the lower lip and chindiamond shaped area at the center of the upper lip and base of the nosephiltrumvermillion borderits transitional epithelium between the mucos membrane of the lip and skin

it amount depend on the pulk of orbicularis oris muscle

in reduction of the vermillion border it should be restored by the dentureangle of the mouththe denture should suppurt the angle of the mouth

lack support lead to

angular chielitisangular chielitisits afissuring and inflammation of the angle of the mouth due to continous dribbling of salivary secretion and decrease vertical dimensionmodiolusthe meeting place between the buccinator and other facial muscle near the angle of the mouthintraoral maxillary landmarksintraoral mandibular landmarksalveolar ridge may be severely resorbed which affect retention of the dentureresidual alveolar ridgeit is the part of alveolar process which remains after teeth extractionthe highest surface is called creast of the ridge

it's covered with alayer of firm fibrous C.T which is good for suppurting denture and resist denture movementit's aprominence at the end of the maxillary alveolar ridge

it round bulge bounded by deep sulci

it give resistence to lateral movement of the denture

if it enlarged sergical reduction is done to give room for dentuermaxillary tuberositypalatine vaultit's formed anteriorly by the hard palate& posteriorly by the soft palate

the alveolar arch forms the lateral and anterior boundaries of the vault

median palatine rapheit's raised area of mucous membrane at midpalatal suture formed by union of two palatine process of maxilla

if it prominence it cause discomfort to the patient ,loss of retention of denture & may be fracture so,it should be relived at this arearugea areairregular shaped ridges of C.T in anterior 2/3 of hard palate extending lateraly from the midline it's serves as one of secondary stress bearing areatorus palatinesit's abony ridge at the centre of hard palate

if it small the denture base must be relieved at this areaif it large surgical removal should be doneapear shaped elevation of soft tissue at the midline just posterior to the creast of edentulous ridge

after alveolar ridge resorptionpressure from denture in this area cause burning sensationso, it should be relieved at this areaincisive papillafovea palatinaethey are two small bilateral indentations formed by mucous gland ducts

they are located in the posterior aspect of the palate on each side of the mid line close to vibrating line hamular notchnarrow depression between the bony maxillary tuberosity and pterygoid hamulus

posterior palatal seal should extend through the hamular notchvibrating lineit determine the posterior border of the upper denture at the junction of movable and immovable soft palateit determined by two ways 1- 2mm posteriorly to fovea palatinae 2- line from one hamular notch to the otherresidual alveolar ridgeit is apart of alveolar process which remains after teeth extraction

it covered by fibrous C.T

it may severly resorbed which affects the retention of the denture

it act as secondary stress bearing arearetromolar padit is inverted pear shape area at the posterior end of the mandible creating from scarring after tooth extraction

it is primary stress bearing areamental foramenit located on the buccal surface of mandible in the premolar region

the montal nerve & vessels pass through

in case of flat ridge pressure on the mental nerve cause anomilistorus mandibularisit is abony projection in the lingual surface of the mandible in the premolar region

if it small the denture require relieve in this area

if it too large it require surgical removalit is abony ridge in the inner surface of the mandible

it begins from the region of the third molar

descends obliquely dowward and forward to the lower border of the mandible near the mid lineit infience the length of lingual flange

if it promenint it require relieveinternal oblique ridge (mylohyoid ridge)external oblique ridgemedian palatine raphebuccal shelfit is considered as primary stress bearing area of mandibular denture as the bitting forces are perpendicular on it

located between mandibular buccal frenum and the anterior border of masseter muscle

it is bounded externally by external oblique ridge and internally by the slope of the residual ridge

buccal frenummasseter musclebuccal shelfgenial tuberclsthey are two small prominces on the inner surface of the mandiblethey represent the attachment of the genioglossus and geniohyoid muscles

in the case of severe flat ridge the will not able to withstand the pressure of the denture flange they require relife in this areastress bearing areasthe denture base must extend as far as possible withe out inter fering the health or function of the tissue

as the amount of bitting forces that an edentulous ridge will tolerate is directly proportional to the amount of surface area coveredprimary stress bearing areas in maxillahorizontal portion of hard palateresidual alveolar ridgesecondary stress bearing areas in maxillamaxillary tuberosityrugae areamedian palatine rapheprimary stress bearing areas of the mandiblesecondary stress bearing areas of the mandiblebuccal shelfretromolar padresidual alveolar ridgegenial tuberclesboreder structure that limit the periphery of the denturemaxillary border structurelabial frenumit is afold of mucous membrane extending from the mucous linning the lips toward the crest of the ridge

it must be relieved by making V shaped notch in the labial flange of the denture

labial vestibuleit is reflection of the mucosa of the lip to the mucousa of the alveolar process in the labial vestibule

the denture in this area is related to the orbicularis oris and superior incisive muscle

the muscle limit the thickness and length of the labial flangebuccal frenumbuccal vestibulethe denture in this area is related to the buccinator musclethe contraction of the muscle lead to displacement of the denture so,the denture should be relievedhamular notchvibrating linemandibular border structurelabial frenumlabial vestibulebuccal frenumbuccal vestibulebuccal shelfit form good support for the lower denturelingual frenumshould be relieved to allow the movement of the tongue without impiginationretromolar padlingual pouchmasseter muscleligual pouchthe lingual flange is related to lingual pouch